Have a 2E/slightly wider foot - I use custom orthotics. Been hard to find shoes that fit my foot, and work for how much I sprint, etc. Weirdly I do not have a flat foot - something happens in shoes which makes me pronate more/harder to splay toes leading to shin and knee pain (no structural issues). This is the only 2E shoe that is wide enough to accommodate my foot w/ orthotic, and not destroy my pinky toes (CT Rally 2E killed me).
The issue with the Res 8/9 is that the orthotic raised my feet slightly, which led to heel slippage. This is slightly reduced in this model thanks to the raised part, but it's still there. Some have said that you can't do a runners knot, but you can do a variation of it. With a less maximal insole, like superfeet or something, there would be little to no heel slippage.
As some have noted this shoe is about a half size long, and the regular width is slightly wide as well.
Another thing to note, I hit for 30 minutes or so without using any corrective orthotic, and this is the first shoe that kept my arch intact and I had no pain. Something to consider.
Also, underfoot it's probably the most comfortable and springy shoe I've used. Definitely aids in and makes running and cutting easier as well.